PM Filter Conditioning: Why Filters Need 24 Hours Before Weighing
When a particulate matter (PM) filter comes back from the field visibly darkened with dust, it is tempting to assume
13Oct
12Oct
Growth Promotion Test Inoculum and Plate Size: Why 75 CFU Doesn’t Fit Every Plate
During a microbiology audit, an auditor asked a deceptively simple question: “Why did you use the same inoculum (75 CFU)
11Oct
Pathogen Testing in Purified Water: Why Pharma Tests Beyond USP, EP and JP
If you have worked with Purified Water (PW) in pharmaceutical or medical device manufacturing, you may have asked a fair
10Oct
Water System Qualification: The Right Approach for a Robust, GMP-Compliant System
A pharmaceutical water system is a critical GMP utility. It has to deliver water that meets predefined quality requirements, not
09Oct
Hydrogen Peroxide vs Formaldehyde Fumigation in Cleanrooms: Why Pharma Is Making the Switch
For years, many pharmaceutical facilities treated formaldehyde as the “perfect” fumigant. It was cheap, it killed microbes, and it appeared
04Oct
Feller Correction in Air Sampling: Why r and Pr Start Differing
During a routine air sampling check, a simple question came up: “Why do r and Pr start differing after 17?”
04Oct
Environmental Isolates in Growth Promotion Testing: Why ATCC Strains Aren’t Enough
You walk into your facility. Your EM plates look clean. Your media passes growth promotion testing (GPT) with ATCC strains,
03Oct
Why Do Microbiology Reports Say <1 CFU Instead of 0 CFU?
You open the incubator. You look at the plate. Nothing is growing. Not a single colony. So the obvious question
03Oct
Settle Plate Placement in Cleanroom: Why Location Decides Everything
Picture an aseptic cleanroom on a good day. The HEPA filters are performing efficiently, differential pressures are within limits, and
27Sep
Environmental Monitoring Trending in Pharmaceutical Manufacturing: Why One Isolate Is Never Just One Isolate
Is your environmental monitoring (EM) program actually strengthening your contamination control strategy or is it just generating paperwork that gets